F 14 Bearing series (series name) Description Page NU32 Single-row cylindrical roller bearing, outer ring with ribs, inner ring without ribs A7, A55, A56, B139, B142 NU33 Single-row cylindrical roller bearing, outer ring with ribs, inner ring without ribs A7, A55, A56, B139, B144 NU4 Single-row cylindrical roller bearing, outer ring with ribs, inner ring without ribs A7, A55, A56, B139, B144 NUP10 Single-row cylindrical roller bearing, outer ring with ribs, inner ring without rib on single side, with loose rib A7, A56, B139, B142 NUP2 Single-row cylindrical roller bearing, outer ring with ribs, inner ring without rib on single side, with loose rib A7, A56, B139, B142 NUP22 Single-row cylindrical roller bearing, outer ring with ribs, inner ring without rib on single side, with loose rib A7, A56, B139, B142 NUP23 Single-row cylindrical roller bearing, outer ring with ribs, inner ring without rib on single side, with loose rib A7, A56, B139, B142 NUP3 Single-row cylindrical roller bearing, outer ring with ribs, inner ring without rib on single side, with loose rib A7, A56, B139, B142 NUP4 Single-row cylindrical roller bearing, outer ring with ribs, inner ring without rib on single side, with loose rib A7, A56, B139, B144 RNA48 Heavy-duty needle roller bearing, caged, with ribs (integral), without inner ring, one lubrication hole and lubrication groove in the outer ring, metric series A8, A55, A56, A59, B363, B438 RNA49 Heavy-duty needle roller bearing, caged, with ribs (integral), without inner ring, one lubrication hole and lubrication groove in the outer ring, metric series A8, A55, A56, A59, B363, B432 RNA69 Heavy-duty needle roller bearing, caged, with ribs (inserted or integral), without inner ring, one lubrication hole and lubrication groove in the outer ring, metric series A8, A55, A56, A59, B363, B432 SDE Linear ball bearing, metric series C32, C35 SDM Linear ball bearing, metric series C32, C35 SDMF Linear ball bearing, round-flanged type, metric series C32, C41 SDMK Linear ball bearing, square-flanged type, metric series C32, C41 TR Race A, B, C, etc. indicates race thickness A12, B363, B452 W60··ZZX Extra-small ball bearing, miniature ball bearing, shielded A4, A56, B5, B40 W68··2RD Extra-small ball bearing, miniature ball bearing, extremely light contact sealed A4, A56, B5, B44 W68··2RS Extra-small ball bearing, miniature ball bearing, contact sealed A4, A56, B5, B44 W68··2RU Extra-small ball bearing, miniature ball bearing, non-contact sealed A4, A56, B5, B44 W68··ZZ Extra-small ball bearing, miniature ball bearing, shielded A4, A56, B5, B40